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Yumiko Watanabe
Pennsylvania State University

Current Projects

NAI Project Collaborators

Publications

  • Hoashi, M., Bevacqua, D. C., Otake, T., Watanabe, Y., Hickman, A. H., Utsunomiya, S., & Ohmoto, H. (2009). Primary haematite formation in an oxygenated sea 3.46 billion years ago. Nature Geosci, 2(4), 301–306. doi:10.1038/ngeo465

    See Project See Project

  • Ohmoto, H., Watanabe, Y., Lasaga, A. C., Naraoka, H., Johnson, I., Brainard, J., & Chorney, A. (2014). Oxygen, iron, and sulfur geochemical cycles on early Earth: Paradigms and contradictions. Earth’s Early Atmosphere and Surface Environment, None, 55–95. doi:10.1130/2014.2504(09)

    See Project
  • Hamasaki, H., Watanabe, Y. & Ohmoto, H.  (In Preparation).  An experimental investigation of multiple sulfur isotope fractionations during heterogeneous reactions between SO2 and activated carbon.  Geochimica et Cosmochimica Acta. See Project
  • Hoashi, M., Watanabe, Y. & Ohmoto, H.  (2009).  Primary hematite formation in an oxygenated deep sea 3.46 billion years ago. 19th Goldschmidt conference, Davos, Switzerland.  Geochim. Cosmochim. Acta, 73(13S): A536. See Project
  • Hoashi, M., Watanabe, Y. & Ohmoto, H.  (2009).  Primary hematite formation in an oxygenated deep sea 3.46 billion years ago.  Goldschmidt conference.  Davos, Switzerland. See Project See Project
  • Johnson, I., Watanabe, Y., Stewart, B. & And Ohmoto, H.  (2010).  Evidence for terrestrial life and an O2-rich atmosphere in the oldest (~3.4 Ga) paleosol in the east Pilbara craton, Western Australia.  6th Astrobiology Sci. Conference.  League City, TX. See Project
  • Johnson, I., Watanabe, Y., Stewart, B. & Ohmoto, H.  (2009).  Earth’s oldest (~3.4 Ga) lateritic paleosol in he Pilbara Craton, Western Australia.  Goldschmidt conference.  Davos, Switzerland. See Project See Project
  • Ohmoto, H., Bevacqua, D.C. & Watanabe, Y.  (2009).  Alteration of submarine volcanic rocks in oxygenated Archean oceans.  American Geophysical Union Annual Meeting.  San Francisco, CA. See Project See Project
  • Ohmoto, H., Bevacqua, D.C. & Watanabe, Y.  (2010).  Hydrothermal alteration chemistry of Archean submarine volcanic rocks: evidence for a fully oxygenated atmosphere-ocean system since ~3.5 Ga.  6th Astrobiology Sci. Conference.  League City, TX. See Project
  • Ohmoto, H., Bevacqua, D.C., Johnson, I. & Watanabe, Y.  (2010).  Geochemical cycles of Fe, Mo, U, Cu, Cr, REEs, and S during the period 3.5-3.2 Ga ago.  Geochim. Cosmochim. Acta, 74(12S): A774. See Project
  • Ohmoto, H., Bevacqua, D.C., Watanabe, Y. & Yamaguchi, K.  (In Review).  Iron-poor, but uranium- and lithium-rich, Archaean oceans.  Nature Geosciences. See Project
  • Ohmoto, H., Lasaga, A.C., Watanabe, Y. & Otake, T.  (In Preparation).  Anomalous isotope fractionations of sulfur.  Geochemical. See Project
  • Ohmoto, H., Lasaga, A.C., Watanabe, Y. & Yamaguchi, K.  (In Preparation).  Evidence for the fully-oxygenated oceans and atmosphere during the Archean Eons.  Monograph of the Geological Society of America. See Project
  • Otake, T. & Watanabe, Y.  (2011).  Using multiple sulfur isotopes to understand the Earth’s surface environments during the Archean era.  Geochemical Journal, 45: 251-264. See Project
  • Otake, T. & Watanabe, Y.  (In Press).  Using multiple sulfur isotopes to understand the Earth’s surface environments during the Archean era.  Geochemical. See Project
  • Otake, T., Lasaga, A.C., Watanabe, Y. & Ohmoto, H.  (2009).  Theoretical investigations of anomalous fractionation of sulfur isotopes during a surface reaction. AGU Fall Meeting, San Francisco, CA.  EOS, 90(52): V11A-1932. See Project
  • Watanabe, Y. & Ohmoto, H.  (2009).  Why anomalous S isotope signatures disappeared at 2.4 Ga ago? 19th Goldschmidt Conference, Davos, Switzerland.  Geochim. Cosmochim. Acta, 73(13S): A1420. See Project
  • Watanabe, Y. & Ohmoto, H.  (2010).  Connection between depositional environments and multiple sulfur isotope ratios of sulfides and sulfates in Archean sedimentary rocks.  6th Astrobiology Sci. Conference.  League City, TX. See Project
  • Watanabe, Y., Choney, A. & Ohmoto, H.  (In Preparation).  Multiple isotope fractionations of sulfur during thermochemical sulfate reduction by solid organic matter.  Geochimica et Cosmochimica Acta. See Project
  • Watanabe, Y., Hoashi, M. & Ohmoto, H.  (2010).  Evidence for the presence of cyanobacteria and thermophylic methanogens in a 3.46 Ga sea, Western Australia [Goldschmidt conference].  Geochim. Cosmochim. Acta, 74(12S): A1116. See Project
  • Yamaguchi, K.E., Kato, Y., Nakamura, K., Suzuki, K., Watanabe, Y., Nedachi, M. & Ohmoto, H.  (2009).  REE+Y geochemistry of the 3.46 Ga Marble Bar Chert recovered by the Archea Biosphere Drilling Project. 19th Goldschmidt Conference, Davos, Switzerland.  Geochim. Cosmochim. Acta, 73(13S): A1469. See Project
  • Yamaguchi, K.E., Kato, Y., Nakamura, K., Suzuki, K., Watanabe, Y., Nedachi, M. & Ohmoto, H.  (2009).  REE+Y geochemistry of the 3.46 Ga Marble Bar Chert recovered by the Archean Biosphere Drilling Project.  Goldschmidt Conference.  Davos, Switzerland. See Project See Project
  • View all 22 publications

Past NAI Teams